A SIW Multi-Beam Feed Network for 5×5 Orthogonal Beams

In this paper, a feed network capable of generating 5 orthogonal beams is proposed based on substrate-integrated waveguide (SIW). The feed network consists of eight couplers and two crossovers, which is quite simple and can be realized in a single-layer substrate. To validate the effectiveness of this structure, a prototype operating at 5.1 GHz was designed, fabricated and measured. The results show that the measured S-parameters and radiation patterns of all five ports are in good agreement with the simulated ones.